Class Soil Stabilization Techniques
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Transcript of Class Soil Stabilization Techniques
DEFINITION:Chemical or mechanical treatment designed
to increase the stability of a soil mass and improve its engineering properties.
Modification of soil structure and the reduction of the moisture content of cohesive soils lead to a considerable improvement in bearing capacity. Modification of soil structure is the concept of soil stabilization.
strength improvementDust controlSoil waterproofing
Slope Failures Bridge FailuresStructural failuresThese above failures can be eliminated by
stabilizing the soil.
Shear strengthDensityPermeability.Surface Area. Atmospheric Conditions.
CompactionAltering size distribution Drying
Compaction has following effects on the soil:Increases densityIncreases strengthReduces permeability
Performance of soil can be greatly improved by drying in sun or oven
Combination of chemical & physical reactions.
Materials known as stabilisers:LimeCementBitumen
Flocculation - fine particles stick together -size
distribution changes
Lime + silica + alumina
Physical reaction
cementgels
chemical reaction
Lime + clay
LIME STABILIZATION –factors affecting
• Pulverization and scarification• Lime content• Uniformity of mixing• Compaction• Curing• Additives
Construction of soil lime base course• Preparation of subgrade• Pulverization of soil to be stabilised• Addition of lime with water and mixing• Allow the mix to age for one day and remix when
pulverization becomes easy• Adding rest of lime,water if necessry and remixing• Spreading to desired grade and compacting• Soil lime protected from drying out and allowed
moist curing• Field tests-OMC at compaction and Dry density after
the compaction.
Low volume road construction -base coarse & wearing coarse.
Sub grade improvement for low & high volume roads.
CEMENT STABILIZATION -factors
• Soil• Cement content• Uniformity of mixing• Compaction• Curing.• Additives
Construction of Soil Cement stabilization
• Preparation of subgrade• Pulverisation of soil• Application of cement and dry mixing• Addition or spraying water and remixing• Spreading and grading• Compaction• Curing the soil cement layer• Field tests
METHOD OF APPLICATION AT SITE
• Cement stabilised soils usually stronger than lime stabilised soils.• Similar uses to lime stabilised soils.
Improves the strength and durabilityStabilisation of sub-grade to increase CBRReductions in bulk dig quantities This technique is a cost effective alternative to
importing aggregates for both temporary and permanent works.
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